CN113304977A - Coating process for inaccessible surface of corrugated web steel-concrete composite beam - Google Patents
Coating process for inaccessible surface of corrugated web steel-concrete composite beam Download PDFInfo
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- CN113304977A CN113304977A CN202110682304.0A CN202110682304A CN113304977A CN 113304977 A CN113304977 A CN 113304977A CN 202110682304 A CN202110682304 A CN 202110682304A CN 113304977 A CN113304977 A CN 113304977A
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- coating
- inaccessible
- paint
- rust conversion
- primer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
- B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
- B05D3/0466—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being a non-reacting gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
- B05D3/0486—Operating the coating or treatment in a controlled atmosphere
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
- B05D7/584—No clear coat specified at least some layers being let to dry, at least partially, before applying the next layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2202/00—Metallic substrate
- B05D2202/10—Metallic substrate based on Fe
Abstract
The invention discloses a coating process for an inaccessible surface of a corrugated web steel-concrete composite beam, which comprises the following steps of: (1) treatment of unreachable surface dirt: firstly, cleaning surface dirt of an inaccessible surface by using a steel wire brush, and wiping off the surface dirt by using cotton yarn dipped with kerosene if the surface dirt exists; (2) coating rust conversion primer; and brushing the rust conversion primer on the surface of the inert gas in a blowing environment to form a rust conversion coating. (3) Coating of the middle layer paint and the surface paint: and spraying or brushing the middle layer paint and the finish paint by taking the rust conversion coating as the primer. The invention provides a construction environment protected by inert gas when the inaccessible surface of the corrugated web steel-concrete composite beam is constructed, and the inaccessible surface is flushed by the inert gas during brushing, so that the dust blowing and moisture isolating effects can be achieved, and the rust conversion primer brushed can be quickly chelated with rust on the surface of steel to form a protective layer, so that the construction environment requirement is reduced, and the corrosion prevention effect can be improved.
Description
Technical Field
The invention belongs to the technical field of steel surface corrosion prevention, and particularly relates to a coating process for an inaccessible surface of a corrugated web steel-concrete composite beam.
Background
After the corrugated web steel-concrete composite beam is produced, the inner surface and the outer surface need to be coated so as to meet the requirement of corrosion resistance years. Before coating construction, sanding and derusting are needed to be carried out on a coating part. However, because a large number of included angles, slits, intersections and other positions exist on the inner surface and the outer surface of the corrugated web steel-concrete composite beam, on one hand, large shot blasting and sand blasting equipment cannot be applied, and the sanding and coating efficiency is seriously reduced. On the other hand, manual sanding and rust removal are not thorough, and hidden troubles are left for subsequent coating construction. The conventional coating mechanical equipment cannot be applied to parts such as included angles, slits, intersections and the like, namely, inaccessible surfaces. The prior art has a process for preventing corrosion of a steel plate by adopting a rust conversion primer, can be applied to the corrosion prevention of an inaccessible surface, and has the construction mode that the rust conversion primer is mainly sprayed or brushed, but the prior art cannot provide a good construction environment for the inaccessible surface in the construction process, the rust conversion primer is easy to be mixed with impurities during construction to cause local peeling or desanding phenomenon, the problem that the construction environment with high humidity influences the drying and fixing time cannot be solved, and the surface corrosion resistance of the steel plate is reduced.
Disclosure of Invention
The invention aims to provide a coating process for the inaccessible surface of a corrugated web steel-concrete composite beam aiming at the defects in the prior art; the process can provide a good external construction environment for rust conversion primer construction, and effectively improve the corrosion resistance of the inaccessible surface.
In order to achieve the purpose, the invention adopts the technical scheme that:
a coating process for an inaccessible surface of a corrugated web steel-concrete composite beam comprises the following steps:
(1) treatment of unreachable surface dirt: firstly, cleaning surface dirt of an inaccessible surface by using a steel wire brush, and wiping off the surface dirt by using cotton yarn dipped with kerosene if the surface dirt exists;
(2) coating rust conversion primer; brushing a rust conversion primer on the surface of the inert gas in a blowing environment to form a rust conversion coating;
(3) coating of the middle layer paint and the surface paint: and spraying or brushing the middle layer paint and the finish paint by taking the rust conversion coating as the primer.
Further, in the step (2), the inert gas surface blowing environment is a local brushing environment formed by blowing compressed nitrogen gas laterally through a gas pipe to an unreachable surface.
Further, in the step (2), when the rust conversion primer is brushed, the gas pipe for compressing nitrogen gas when the rust conversion primer has a downward flowing tendency is blown to the unreachable surface from the downward direction to the upward direction, and the gas pipe for compressing nitrogen gas is blown to the unreachable surface along the brushing direction under other brushing conditions.
Further, in the step (2), rust conversion primer is applied twice to the surface with serious rust, and the second time is finished within 20-30 min after the first brush coating.
Further, the brushing external environments of the rust conversion primer in the step (2) and the middle layer paint and the top paint in the step (3) are as follows: the environmental temperature is required to be not lower than 5 ℃, not higher than 40 ℃, the humidity is not higher than 85%, and the surface temperature of the steel is higher than the measured dew point by at least 3 ℃; the surface of the constructed object should be kept dry and no condensation is allowed; the outdoor coating is stopped in the weather of rain, fog, snow and strong wind.
Further, after the inaccessible surface is dried for 24 hours, coating a middle layer paint and a finish paint; the intermediate layer paint and the surface paint can be solvent-based paint or water-based paint.
The invention has the beneficial effects that:
when the rust conversion primer is used for construction of inaccessible surfaces, a construction environment protected by inert gas is provided, the inaccessible surfaces are flushed by the inert gas during brushing, dust blowing and moisture isolation effects can be achieved, and the brushed rust conversion primer can be quickly chelated with rust on the surfaces of steel to form a protective layer, so that the construction environment requirement is reduced, and the corrosion prevention effect can be improved; the inert gas surface blowing environment is a local brushing environment formed by laterally blowing compressed nitrogen through an air pipe to an unreachable surface, the rust conversion primer is water-based paint and is easy to flow during brushing, and when the rust conversion primer has a downward flowing trend, the reverse blowing of the air pipe can be utilized to inhibit the flow of the rust conversion primer, so that the thickness of the coating is relatively uniform, the permeability of the rust conversion primer is improved, and the corrosion resistance is further improved.
Drawings
In order to more clearly explain the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.
Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and thus should not be considered limiting.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The inaccessible surface mentioned in the invention refers to an included angle, a slit, a cross part and the like which cannot be applied by conventional coating mechanical equipment, but the process mentioned in the invention only aims at the inaccessible surface, the coating surface which can be finished by the conventional coating equipment still adopts conventional operation processes such as shot blasting, sand blasting, paint coating and the like, and the conventional coating operation is still superior to the application process using rust conversion primer in the aspects of ensuring the material performance, the corrosion resistance and the stability; the corrugated web steel-concrete composite beam structurally has a large number of included angles, slits, intersections and other parts, is suitable for being coated by adopting the process, and can improve the coating efficiency while improving the corrosion resistance.
As shown in fig. 1, a coating process for an inaccessible surface of a corrugated web steel-concrete composite beam comprises the following steps:
(1) treatment of unreachable surface dirt: the treatment of the soil on the inaccessible side serves to provide a good substrate for the rust converting primer, increasing the permeability and bondability of the rust converting primer; the specific operation is that the surface dirt of the inaccessible surface is cleaned by a steel wire brush, such as rust blocks, sludge welding slag, coatings, burrs and the like; when cleaning, rust stains should be kept on the surface of the board, and the metal surface is prohibited from being polished, so that the reaction of the embroidery primer and the metal is influenced; if the metal plate surface has oil stains, the metal plate surface is wiped off by dipping cotton yarn in kerosene; finally, the inaccessible noodles are cleaned by utilizing compressed air or dough.
(2) Coating rust conversion primer; the step is the core of the whole process and is the key for determining the corrosion resistance of the inaccessible surface; the core technical requirement is that the rust conversion primer is coated under the environment of inert gas surface blowing to form a rust conversion coating; the specific operation is as follows: the protection worn by workers is used for coating the primer in a brushing mode, and the brushing mode can improve the permeability of the rust conversion primer on the surface of the metal plate and improve the corrosion resistance; meanwhile, the worker also holds an air pipe capable of spraying inert gas, specifically, compressed nitrogen can be used as an inert gas source, the air pipe laterally sprays the nitrogen to form a local brushing environment, the nitrogen is maintained in a blowing state in the brushing action process, and the nitrogen is sprayed by taking the suspended rust conversion primer liquid drops on the blowing brush to shake without splashing as a standard; the maintenance of the nitrogen environment for brushing can play a role in isolating moisture, isolating dust and promoting the drying of the rust conversion primer, thus reducing the environmental requirements during coating. When the rust conversion primer is brushed, in order to further improve the corrosion resistance, increase the permeability of the rust conversion primer and a metal plate and promote the effective chelation of the rust conversion primer and the steel plate rust, when the rust conversion primer is brushed on site, an air pipe for compressing nitrogen is blown upwards from a downward slope when the rust conversion primer has a downward flowing trend, and as the rust conversion primer is a water-based paint, the fluidity is strong, the rapid downward flowing of paint liquid is inhibited by utilizing a reverse nitrogen blowing mode, the retention amount of the paint liquid on the surface is increased, the reaction effect is improved, and further the corrosion resistance is improved; and under other brushing conditions, the compressed nitrogen gas pipe obliquely blows an unreachable surface along the brushing direction to form a local nitrogen brushing environment. The rust conversion primer forms a rust conversion coating after being brushed. And applying the rust conversion primer twice to the surface with serious rust, and brushing the rust conversion primer twice before the rust conversion primer brushed once is dried and solidified, wherein the rust conversion primer brushed once is finished within 20-30 min after the first brushing.
(3) Coating of the middle layer paint and the surface paint: the middle layer paint and the top coat provide further protection for corrosion prevention, the middle layer paint and the top coat are necessary technical processes of a conventional corrosion prevention technology, and the rust conversion coating formed by the rust conversion primer can be used as the primer, so that the middle layer paint and the top coat can be coated without coating the primer. And (3) drying the inaccessible surface for 24h, and then coating a middle layer paint and a finish paint, wherein the middle layer paint and the finish paint can be solvent-based paint or water-based paint.
In the coating process, the improvement of the corrosion resistance is an indispensable technical requirement for providing a good external construction environment besides the performance of the corrosion-resistant paint; although the environment requirement of external coating can be reduced, the reasonable external environment can further promote the diameter-reducing and corrosion-resisting performance; therefore, when the rust conversion primer, the middle layer paint and the top coat are coated, the following requirements can be met by the external environmental conditions: the environmental temperature is required to be not lower than 5 ℃, not higher than 40 ℃, the humidity is not higher than 85%, and the surface temperature of the steel is higher than the measured dew point by at least 3 ℃; the surface of the constructed object should be kept dry and no condensation is allowed; the outdoor coating is stopped in the weather of rain, fog, snow and strong wind.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (6)
1. A coating process for an inaccessible surface of a corrugated web steel-concrete composite beam is characterized by comprising the following steps:
(1) treatment of unreachable surface dirt: firstly, cleaning surface dirt of an inaccessible surface by using a steel wire brush, and wiping off the surface dirt by using cotton yarn dipped with kerosene if the surface dirt exists;
(2) coating rust conversion primer; brushing a rust conversion primer on the surface of the inert gas in a blowing environment to form a rust conversion coating;
(3) coating of the middle layer paint and the surface paint: and spraying or brushing the middle layer paint and the finish paint by taking the rust conversion coating as the primer.
2. The coating process for the inaccessible surface of the corrugated web steel-concrete composite beam as claimed in claim 1, wherein in the step (2), the inert gas surface blowing environment is a local coating environment formed by compressed nitrogen gas through a gas pipe side blowing on the inaccessible surface.
3. The process for coating the inaccessible surface of the corrugated web steel-concrete composite beam as claimed in claim 2, wherein in the step (2), when the rust conversion primer is coated, the gas pipes for compressing nitrogen gas have a downward flowing tendency to blow the inaccessible surface from the lower part to the upper part obliquely, and under other coating conditions, the gas pipes for compressing nitrogen gas blow the inaccessible surface obliquely along the coating direction.
4. The coating process for the inaccessible surface of the corrugated web steel-concrete composite beam as claimed in claim 1, wherein in the step (2), rust conversion primer is applied twice to the surface with serious rust corrosion, and the second time is completed within 20-30 min after the first brush coating.
5. The coating process for the inaccessible surface of the corrugated web steel-concrete composite beam as claimed in claim 1, wherein the external brushing environment for the rust conversion primer in the step (2) and the middle layer paint and the surface paint coating in the step (3) is as follows: the environmental temperature is required to be not lower than 5 ℃, not higher than 40 ℃, the humidity is not higher than 85%, and the surface temperature of the steel is higher than the measured dew point by at least 3 ℃; the surface of the constructed object should be kept dry and no condensation is allowed; the outdoor coating is stopped in the weather of rain, fog, snow and strong wind.
6. The coating process of the inaccessible surface of the corrugated web steel-concrete composite beam according to claim 1, characterized in that the inaccessible surface is dried for 24 hours and then coated with middle layer paint and finish paint; the intermediate layer paint and the surface paint can be solvent-based paint or water-based paint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110682304.0A CN113304977A (en) | 2021-06-20 | 2021-06-20 | Coating process for inaccessible surface of corrugated web steel-concrete composite beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110682304.0A CN113304977A (en) | 2021-06-20 | 2021-06-20 | Coating process for inaccessible surface of corrugated web steel-concrete composite beam |
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| CN113304977A true CN113304977A (en) | 2021-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110682304.0A Pending CN113304977A (en) | 2021-06-20 | 2021-06-20 | Coating process for inaccessible surface of corrugated web steel-concrete composite beam |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102380471A (en) * | 2010-09-06 | 2012-03-21 | 刘彦 | Coating process for special modified solvent-free epoxy coating for glass reinforced plastic |
| CN106367760A (en) * | 2016-08-29 | 2017-02-01 | 安徽省徽之尚机电科技有限公司 | Steel permeation rust-proof treatment method |
| CN106903029A (en) * | 2017-03-31 | 2017-06-30 | 叶云川 | A kind of steel construction and equipment paint renovation coating process |
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2021
- 2021-06-20 CN CN202110682304.0A patent/CN113304977A/en active Pending
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| CN101191225A (en) * | 2006-11-22 | 2008-06-04 | 宝山钢铁股份有限公司 | Antiseptic wearable coat and coating method thereof |
| CN102380471A (en) * | 2010-09-06 | 2012-03-21 | 刘彦 | Coating process for special modified solvent-free epoxy coating for glass reinforced plastic |
| CN106367760A (en) * | 2016-08-29 | 2017-02-01 | 安徽省徽之尚机电科技有限公司 | Steel permeation rust-proof treatment method |
| CN106903029A (en) * | 2017-03-31 | 2017-06-30 | 叶云川 | A kind of steel construction and equipment paint renovation coating process |
| CN109825122A (en) * | 2018-11-28 | 2019-05-31 | 首钢集团有限公司 | A kind of steel construction low prepared surface anti-corrosion clear coat and coating process |
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